Power system.



W. KIESER.

POWER SYSTEM.

APPLICATION FILED JULY 21,1913.

Patented Sept. l, 1914 FROM AUXlL/ARIES Im/entgr: W lter- Kieser,

His .flttorneg.

Witn essZM y?? w UNITED STATES PATENT OFFICE.

WALTER KIESER, OF

CHARLOTTENBURG, GERMANY, ASSIGNOIB. TO GENERAL ELECTRIC COMPANY, A. CORPORATION OF NEW YORK.

l a rowan SYSTEM.

1 '0 all whom it may concern l Be it known that I, \VALTER KIESER, a citizen of the Swiss Republic, residing at Charlottenburg, Germany, have invented certain new and useful. Improvements ini Power Systems, of which the following is a specification.

The invention relates to ,power systems in which the exhaust from one or more auxil 'iery engines, turbines, pumps, etc., is suplied to an intermediate stage or region of a main engine or turbine to assist in driving the latter.

The object of the invention is the provision of a new and improved valve mechanism for controlling the supply of this exhaust motive fluid to the main engine in such a manner that when the pressure in the region of the main engine that receives the exhaust fluid falls below a certain amount the exhaust from' the auxiliary apparatus will be diverted from the main engine or turbine to another region. The valve mechanism is thus responsive to the pressure in the main engine and is preferably controlled by an abutment, piston or diaphragm that is subjected to the action of the pressures ex isting on the opposite sides of a throttling device arranged in the conduit which con veys the exhaust from the auxiliaries to the intermediate stage or region of the main engine. The diversion of the auxiliary motive fluid prevents the main engine from racing as described further on.

In the drawing which illustrates one of the embodiments of the invention. the initial stage or region of the main turbine or engine 1 is supplied with live steam by a pipe 2, the admission of the steam being regulated by the speed governor 3 that controls suitable admission valve mechanism (not shown), a hydraulic or other pressure motor 4 being preferably interposed between the governor and the valves so that the motor does the Work of moving the valves while the governor has merely to move the controlling valve of the motor. The exlmust from the turbine passes through a pipe 5 to a condenser 6. D I

Exhaust steam or other exhaust motive Specification of Letters Patent.

fluid from auxiliary apparatus. such as smaller eng1nes, pumps, etc., is supplied to PatentedSept. 1, 1914.

gpiicatioirfiled July 21; 1913. Serial No. 780,374.

one of the intermediate or lower pressure stages of the turbine 1 by a pipe 7. Ar ranged intermediate the ends of the pipe 7 1s a v/alve mechanism comprising a casing 8 having a set of ports 9 controlled by a circular or ring valve 10 having a stem 11. On the upper end of the stem is a piston 12. The region above the piston is connected with the interior of the pipe 7 between the valve 10 and the point of admission of the exhaust steam to the intermediate stage of the turbine by apassage 13. The lower side of'the piston, which is of smaller area than the upper side, is subjected to the pressure exhaust steam from the auxiliaries is sup-- plied to the inlet of the valve casing 8, passes through the ports 9 and is delivered by the outlet of the casing to the pipe leading to'the ifitermediate stage of the turbine, the pressures on the opposite sides of the piston 12 being so related that the weight of the valve stem and its attached parts tends to hold the valve 10 open and the valve 14 closed. The area of the ports 9 that are controlled by the valve 10 is less than thetotal area of the nozzles or other fluid discharging devices that receive the exhaust steam when it .enters the turbine and these ports can thus exert a throttling action on the exhaust steam supply to the turbine.

The admission of live steam to the turbine 1 iscontrolled by the governor 3. as has been stated. but since the governor has no control over the admission of the exhaust steam to the intermmiiate stage it is possible that under light load conditions the exhaust steam supply might cause the turbine to race unless it were properly regulated. To obtain this regulation the valves 10 and 14 are provided. \Vhen the pressure in the in- Steam by the governor, this low pressure is communicated to the upper side of the pis ton 12 and the somewhat higher pressure of the exhaust steam supply acting on the lower side of the piston causes it to move upward. The upward movement of the piston also causes the valve 10 to shut off the ports 9 and the valve 14 to open the outlet to thepipe 15 so that the exhaust steam supply will be diverted from the main turbine to the condenser or the atmospheric exhaust pipe. When the valve 14 is entirely open, the steam pressure which acts upon the lower side of the piston 12 falls and the parts 10, 11, 12," 14 move downward due to their weight until by the decrease of the flow of steam to the conduit 15 the pressure in the part of the casing between its inlet and the ports 9 is so increased that the weight of the-valve mechanism is neutralized to a greater or less extent and the valves 10 and- 14 are held in an intermediate position. If

now the steam pressure in the intermediate what loosely in its casing so that when the valve 14 is open a small quantity of exhaust steam, for example, a quantity corresponding to the work ofthe main. turbine at no load, can flow to its low pressure stages.

' These low pressure stages, as has been indicated above, operate as a mixed pressure turbine. That is, they are supplied with steam from two different sources. The steam supplied to the auxiliaries flows through said auxiliaries and the mixed pres sure turbine in series, except when diverted to the condenser or free exhaust. In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative. and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, 1s,

1. In a power system, the combination of a main engine, conduit means for supplying exhaust fluid to an intermediate stage or region of the engine and to another region, a valve mechanism'which regulates the flow through the conduit means, and a device responsive to the pressure in said stage that controls the valve mechanism to divert the supply from it to the other region when said pressure falls below a predetermined value.

2. In a power system the combination of a inain engine, a conduit for supplying exhaust fluid to an intermediate stage or region of the engine, a valve in the conduit for regulating the supply, a device responsive to the pressure in the intermediate stage or region for controlling the valve, a second conduit leading from the first, a valve controlling the second conduit, and means for causing the second valve to open when the first valve is in oved toward its closed position to regulate the supply of exhaust fluid passing toeach conduit.

3. In a power sysbem the combination of a main engine, a conduit for supplying exhaust fluid to an intermediate stage or region of the engine, a throttling valve in. the conduit for regulating the supply, and means actuated by pressures at opposite sides of the valve for controlling said valve.

4. In a power system the combination of a main engine, a conduit for conveying exhaust fluid to an intermediate stage or region of the main engine, a valve in the con-- duit for regulating the supply, a movable abutment subjected to the pressures in the conduit on opposite sides of the valve, a sec- 0nd conduit leading from the first, a valve controlling the second conduit, and means connecting the abitment and the valves.

5.. In a power system the combination of a main engine, a conduit for conveying ex.- haust fluid to an intermediate stage or region of the main engine, a second conduit leadingfrom the first, and valve mechanism for controlling the flow through the con- -duits comprising a casing having ports through which fluid flows to the engine and an outlet leading to the second conduit, valves controlling the ports and the outlet, and a movable piston connected to the valves, said piston being subjected on one side to the pressure within the casing and on the other side to the pressure in the enb 6. In a power system the combination of a main engine, a valve casing, a conduit leading to the casing, a conduit between the casing and the engine, a cylindrical seat in the casing having ports through which fluid flows from one conduit to the other, a ring valve that controls the ports, a stem for the valve, a third conduit leading from the casing, a disk valve on the stem that COI1\IOlS the third conduit, the valves and ports being so arranged that the disk valve opens as the ring valve closes and vice versa, a piston on the stem that is movably mounted in the casing and exposed on one side to the pressure within said casing, and a duct conveying pressure from the second conduit to the other side of the piston.

7. In a power system, the combination of a turbine, acondenser, a oondult for consaid valve means to regulate the exhaust veying exhaust fluid to an intermediate fluid passing to each conduit. 10 stage of the'turbine, branch conduits for In witness whereof, I have hereunto set connecting the first named conduit to the my hand this 9th day of July, 1913.

5 condenser or to atmosphere, valve means for WALTER KIESER.

controlling the flow to the respective con- Witnesses? d'uits, and means responsive to the pressure HERMANN SOHMAND,

in the intermediate stage for controlling WILL-Y NEUMANN. 

